Many people think that more is better when supplying nutrients and that it is better
to have excess nutrients in the solution than levels that are only adequate. This is not true
and this thinking leads to dangerous imbalances in nutrient uptake. For example,
potassium is absorbed rapidly from nutrient solutions. If potassium is supplied at excess
levels its uptake inhibits the uptake of calcium and induces calcium and magnesium
deficiencies. Keeping potassium at appropriately low levels in the root zone significantly
improves calcium uptake and helps to prevent blossom end rot, a common calcium
deficiency disorder in tomato fruits.
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